BUG: unable to handle kernel paging request at fffffbfffffffffe
IP: devpts_mntget+0x135/0x280 fs/devpts/inode.c:173
PGD 21fff4067 P4D 21fff4067 PUD 21fff3067 PMD 21fff2067 PTE 0
Oops: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 9885 Comm: syz-executor4 Not tainted 4.14.0-rc1-next-20170920+ #26
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d8fa6300 task.stack: ffff8801c4b80000
RIP: 0010:devpts_mntget+0x135/0x280 fs/devpts/inode.c:173
RSP: 0018:ffff8801c4b87a50 EFLAGS: 00010a03
RAX: dffffc0000000000 RBX: ffffffffffffffed RCX: ffffc900029c9000
RDX: 1ffffffffffffffe RSI: ffffffff81cba090 RDI: fffffffffffffff5
RBP: ffff8801c4b87ae0 R08: ffff8801db31f340 R09: 1ffff10038970efd
R10: ffff8801d8fa6300 R11: 0000000000000000 R12: 1ffff10038970f4a
R13: ffff8801c4b87a70 R14: ffff8801c9b82600 R15: ffff8801c4b87b20
FS:  00007f172de3c700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffbfffffffffe CR3: 00000001cae40000 CR4: 00000000001406e0
DR0: 0000000020000000 DR1: 0000000020001010 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 ptm_open_peer+0x11a/0x2f0 drivers/tty/pty.c:631
 tty_ioctl+0x50f/0x15f0 drivers/tty/tty_io.c:2621
 vfs_ioctl fs/ioctl.c:45 [inline]
 do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
 SYSC_ioctl fs/ioctl.c:700 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
 entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x4520a9
RSP: 002b:00007f172de3bc08 EFLAGS: 00000216 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000718000 RCX: 00000000004520a9
RDX: 0000000020324000 RSI: 2000000000005441 RDI: 000000000000001a
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000216 R12: 00000000004bc2d3
R13: 00000000ffffffff R14: 0000000002020600 R15: 0000000000000000
Code: c1 ea 03 80 3c 02 00 0f 85 56 01 00 00 48 8b 5d 90 e8 00 4e a2 ff 48 8d 7b 08 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 24 01 00 00 4c 8b 7b 08 48 b8 00 00 00 00 00 
RIP: devpts_mntget+0x135/0x280 fs/devpts/inode.c:173 RSP: ffff8801c4b87a50
CR2: fffffbfffffffffe
---[ end trace a002bfd49c9e5419 ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..